Breathblock

An invisible barrier of magical force appears and protects you. Until the start of your next turn, you may add your spellcasting ability modifier to your AC, and to all your saving throws against breath weapons.

In addition, if you succeed a saving throw against a breath weapon while under the effect of this spell, you take no damage from the effect, and the attacker must make a dexterity save against your spellcasting DC or take an amount of force damage equal to the damage of its breath weapon.